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Home / Glossary / CBC
Glossary · Security

CBC

Cipher Block Chaining

In plain language

A method of scrambling data in blocks where each block depends on the one before it.

The metaphor

Like a chain of locked boxes where each box's lock is set by the previous box, so repeating patterns do not show.

Going deeper

How it works

  • Each block is mixed with the one before.
  • A random starting value is used.
  • Used in older web and disk encryption.
  • Newer systems prefer other modes.
In practice
  • An older secure connection uses it.
  • A security scan recommends moving to a newer mode.
  • A disk encryption setting lists it.

A question owners ask

Is it safe?

Used correctly it was, but newer modes are preferred and your provider can update settings.

Related terms
AAAAuthentication, Authorization, and AccountingAccount takeoverACLAccess Control ListAdmin accountAESAdvanced Encryption StandardAES-256Advanced Encryption Standards 256-bitAISAutomated Indicator SharingAPTAdvanced Persistent Threat

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